This is primarily an autism focused question, although allistics please do chime in if you have something interesting to say!
I’m not referring to stuff like Therians or “not feeling human”, although those are deeply fascinating topics. No I’m strictly referring to finding the task of imagining the human form (in say “daydream stories”) to be unpleasant/uncomfortable.
When I was real young I was REALLY uncomfortable imagining the human form. No problems with animals and weird creatures thought up by toddler me, those didn’t make me uncomfortable!
I brought this up with my IRL friend who’s also autistic. He also experienced something similar!
Anyone else also do this? I kinda want to just… Talk about it. It’s interesting.

I’m quite visual, but I can be quite language based at times too.
Rehashing sentences/phrases until they “feel right”. Stuff like that.